Sometimes when a persistent noise goes away I will realize that I've been slightly tense the whole time and all of a sudden I feel relief. Depending on what you

Sometimes when a persistent noise goes away I will realize that I've been slightly tense the whole time and all of a sudden I feel relief. Depending on what you mean by "switched on the wifi", could it be that there is some subtle piezoelectric noise that goes away when you turn of a device completely?